Carnegie Stage 15

Introduction

Stage 15 embryos have a greatest length of 7 to 9 mm and an estimated postfertilization age of 41 days. The lens vesicle, nasal pit and hand plate are present and the future cerebral hemisphere is distinct. The stage is represented by Carnegie embryo #721. It has a greatest length of 9.0 mm (after fixation) and is median within the stage.